How to fix backend not ready in Kubernetes

What this error means

No healthy endpoints found for backend service

Typical symptoms

• 502 Bad Gateway
• backend status error
• external IP exists
• service unreachable
• intermittent

Common causes

1. readiness failing
2. selector mismatch
3. pods not running
4. no endpoints
5. wrong service
6. isolation

How to fix "backend not ready"

Advanced notes

Related errors

• Failed to connect to server: connection refused (HTTP/2)

  How to fix "HTTP/2 connection refused" error in Kubernetes

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• missing request for cpu in container

  How to fix "missing request for cpu in container" in Kubernetes HPA

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• error: invalid configuration

  How to fix "error: invalid configuration" in Kubernetes

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Official resources & further reading

• 📚Kubernetes Official Documentation
• 📖
  Kubernetes API Reference(Official Docs)
• 📖
  Kubernetes Tasks: Run Applications(Official Docs)
• 💬
  Stack Overflow: Kubernetes ingress backend not ready(Stack Overflow)
• 🐙
  Kubernetes GitHub Issues(GitHub)